參數(shù)資料
型號： TMS370CxCxFN
廠商： Texas Instruments, Inc.
英文描述： Silver Mica Capacitor; Capacitance:270pF; Capacitance Tolerance:+/- 5%; Series:CD4; Voltage Rating:500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:2.5mm; Leaded Process Compatible:No RoHS Compliant: No
中文描述： 8位微控制器
文件頁數(shù)： 16/54頁
文件大小： 785K
代理商： TMS370CXCXFN
TMS370Cx9x
8-BIT MICROCONTROLLER
SPNS036B – JANUARY 1996 – REVISED FEBRUARY 1997
16
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
clock modules
The ‘370Cx9x family provides two clock options which are referred to as divide-by-1 (PLL) and divide-by-4
(standard oscillator). Both the divide-by-1 and divide-by-4 options are configurable during the manufacturing
process of a TMS370 microcontroller. The ‘370C090A ROM-masked devices offer both options to meet system
engineering requirements. Only one of the two clock options is allowed on the ROM device while the EPROM
device ’792 has only the divide-by-4 clock.
The divide-by-1 clock module option provides the capability for reduced electromagnetic interference (EMI) with
no added cost.
The divide-by-1 provides a 1-to-1 match of the external resonator frequency (CLKIN) to the internal system clock
(SYSCLK) frequency. The divide-by-4 produces a SYSCLK which is one-fourth the frequency of the external
resonator. Inside the divide-by-1 module, the frequency of the external resonator is multiplied by four. The clock
module then divides the resulting signal by four to provide the four-phased internal system clock signals. The
resulting SYSCLK is equal to the resonator frequency. The frequencies are formulated as follows:
Divide-by-4 option : SYSCLK
external resonator frequency
4
external resonator frequency
CLKIN
4
Divide-by-1 option : SYSCLK
4
4
CLKIN
The main advantage of choosing a divide-by-1 oscillator is that EMI is reduced. The harmonics of low-speed
resonators extend through less of the emissions spectrum than the harmonics of faster resonators. The
divide-by-1 provides the capability of reducing the resonator speed by four times, and this results in a steeper
decay of emissions produced by the oscillator.
相關(guān)PDF資料
PDF描述
TMS370CxCxFZ Silver Mica Capacitor; Capacitance:270pF; Capacitance Tolerance:+/- 5%; Series:CD4; Voltage Rating:500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:2.5mm; Leaded Process Compatible:Yes RoHS Compliant: Yes
TMS370CxCxJD Silver Mica Capacitor; Capacitance:300pF; Capacitance Tolerance:+/- 1%; Series:CD4; Voltage Rating:500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:2.5mm; Leaded Process Compatible:No RoHS Compliant: No
TMS370CxCxN Silver Mica Capacitor; Capacitance:300pF; Capacitance Tolerance:+/- 1%; Series:CD4; Voltage Rating:500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:2.5mm; Leaded Process Compatible:Yes RoHS Compliant: Yes
TMS370Cx9xFN 8-BIT MICROCONTROLLER
TMS370Cx9xFZ 8-BIT MICROCONTROLLER
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